Which material is cut with a ceramic knife?

• A. Extruded Foam Armaflex
• B. Polystyrene
• C. Polyurethane
• D. Welders

Answer: (A)

Focusing on how the material behaves when cut shows why a ceramic knife is the right choice for extruded foam Armaflex. This elastomeric insulation is soft, flexible, and can deform or tear if cut with a dull or heat-generating blade. A ceramic blade stays incredibly sharp for longer and resists heat buildup, producing clean, precise edges in the foam. That crisp edge is important for fitting tightly around pipes and ensuring an airtight, effective insulation seam without snags or frayed edges.

Polystyrene, polyurethane, or a welded material don’t demand the same cutting behavior. They typically use other blades or cutting methods suited to their rigidity, density, or surface characteristics, whereas the soft, open-edged nature of Armaflex benefits most from the clean, long-lasting edge of a ceramic knife.